M16 / M4 / AR Carry handle rail adapter
thingiverse
Couldn't find any so I made one. Should do fine for paintball and airsoft, but I'm not sure I'd trust a 3d printed mount for a real weapon, or with an expensive optic. Rail dimensions should be mostly to spec and should fit most carrying handles. You will need some kind of screw and nut to mount it. The hole for the screw is about 4.5mm wide for the shaft and 8mm wide for the head. The screw will need to be at least 30mm long.
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